NBMiner v42.0

• feature: ethash Extend LHR unlocker work with old driver versions. All previous drivers should work except 515.x and newer.
• fix: ethash Improve LHR unlocker stability under Linux.
• optimize: ethash small hashrate improvement on Nvidia GPUs.
• feature: Add GDDR6X memory temp in summary table for Linux.
• feature: Add GPU RAM type and GPU RAM vendor in log.
• feature: Add Nvidia driver versoin in summary table.
• feature: If Overclock applies through nbminer, reset settings to stock when miner exit.
• feature: -mt option on windows does not require custom driver anymore (admin priviledge is required).
• NOTE: NBMiner versions older than v39.5 (not included) will run into issue when ETH reaches EPOCH 520 (Approx mid September). Please make sure to upgrade to a newer version before that if ETH is still with POW.